Disable each MachineFunctionPass for 'optnone' functions, unless that

pass normally runs at optimization level None, or is part of the
register allocation pipeline.

llvm-svn: 205228

llvm/lib/CodeGen/StackColoring.cpp

@@ -640,6 +640,9 @@ void StackColoring::expungeSlotMap(DenseMap<int, int> &SlotRemap,
 }
 
 bool StackColoring::runOnMachineFunction(MachineFunction &Func) {
+  if (skipOptnoneFunction(*Func.getFunction()))
+    return false;
+
   DEBUG(dbgs() << "********** Stack Coloring **********\n"
                << "********** Function: "
                << ((const Value*)Func.getFunction())->getName() << '\n');